$\left(\frac{1}{5}x^2+2\right)\left(\frac{1}{5}x^2+3\right)$
$2^x\cdot2$
$13a^2+7a-6$
$\frac{36m^2-36n^2x^2}{6m-7nx^2}$
$1+\left(-4\right)+1$
$y\sqrt{2x+1}\frac{dy}{dx}-y^2=0$
$\frac{x^2+2x-15}{x-1}$
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